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Hi Apologies for not providing an update before but have been on holiday and other commitments. I can report that Fault Code 75 eventually came up - No pressure rise detected on turning on the pump. I drained the system down, flushed it through with cold water, refilled and the boiler...

Hi I've not had any fault codes displayed. S.53 to me now implies the differential between flow and return is too great rather than that either one is out of range. Not sure if that was what you meant. It does seem a bit strange that the problem is not regarded as a fault - maybe it's...

Hi Thanks for your replies. It would seem that a 'water shortage' is the key which could perhaps be explained by some sort of blockage or flow problem. Another source has clarified that the VL-RL spread refers to the Flow and Return differential temperature. The system was power flushed...

Hi I have a Vailant ecoTEC plus boiler less than 1 year old. It has started making knocking noises occasionally, accompanied by a Status Code S.53. Otherwise operation is fine. The installation guide says this means 'appliance is within the waiting period of the operation block function...